如题，破解版stata16，命令栏输入net from https://www.sealedenvelope.com/后，系统报错如下：


PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
https://www.sealedenvelope.com/ either
  1)  is not a valid URL, or
  2)  could not be contacted, or
  3)  is not a Stata download site (has no stata.toc file).

current site is still http://www.stata-journal.com/software/sj4-3/
r(5100);


作业需要用到xfill，求大佬支招如何下这个xfill，跪谢